Your image speaks volumes about the quality of your work to people who haven't yet seen the quality of your work. If you dress neatly, people will be more likely to assume you have your act together and are a good detailer. But after that first interaction, it's the quality of your work that will speak for (or against) you.
If I am going to be on the grounds of the local country club or in business parking lots doing details, I wear khakis and polos. Most of these places have a dress code (formal or informally outlined) for their members/ employees. Dress like they do and they will accept you as one of them....and not as that dirty guy who cleans cars.
If I am on my daily rounds through the neighborhoods, I wear a polo and khaki shorts.
